Why is Python Flask form validation not working in Safari browser?

Question

Python

Good evening, I can't figure out why the Python Flask form validation fails in the Safare browser. After clicking on the "send" button - the line if forms.validate():does not go further. When at the same time on any other browser - the form is sent and the data gets into the DB.

forms = GeneralForm(request.form)

    if forms.validate():
        try:
            apps = Messages(request.form['name'], request.form['phone'], request.form['state'])
            db.session.add(apps)
            db.session.commit()
        except KeyError as e:
            db.session.rollback()
            app.logger.error(e)